The judge recognized it was an ordinary, legal knife which could have unintentionally developed the characteristics of a prohibited weapon.
I've read about that kind of decisions by judges in both Canada and Britain. Apparently, they are at least somewhat interested in the INTENT of the law.
Here in the U.S., that doesn't seem to be the case -- here it is only the LETTER of the law. Here, judges seem to be nothing but tax collectors in black robes.
Even 25+ years ago, it was like this. For instance, a man was walking with his family from a parking lot to a restaurant in San Jose, CA. An off-duty, out-of-uniform LEO in his own personal, unlighted car, ripped through the parking lot at a fairly high rate of speed (for a parking lot), and almost hit one of the kids. Mom grabbed the boy's clothes and jerked him back, Dad slapped the back of the car with the flat of his hand. Dad subsequently received a fine by the judge for interfering with a police office.
The red-light cameras are touted as safety features, but to collect more fines, the yellow-light timing has been shortened.
As one of our members here once said, "America doesn't have a judicial system, it has a legal system".
Sue